2556289 has 4 divisors (see below), whose sum is σ = 2667456. Its totient is φ = 2445124.

The previous prime is 2556277. The next prime is 2556331. The reversal of 2556289 is 9826552.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2556289 - 2⁷ = 2556161 is a prime.

It is a super-2 number, since 2×2556289² = 13069226903042, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2³ + 5⁷ + 5⁹ + 6 + 2¹⁹ + 8 + 9³ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55549 + ... + 55594.

It is an arithmetic number, because the mean of its divisors is an integer number (666864).

2^2556289 is an apocalyptic number.

It is an amenable number.

2556289 is a deficient number, since it is larger than the sum of its proper divisors (111167).

2556289 is a wasteful number, since it uses less digits than its factorization.

2556289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111166.

The product of its digits is 43200, while the sum is 37.

The square root of 2556289 is about 1598.8398919216. The cubic root of 2556289 is about 136.7319425104.

It can be divided in two parts, 25562 and 89, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 2556289 in words is "two million, five hundred fifty-six thousand, two hundred eighty-nine".